/Engine/Source/Runtime/GeometryCore/Public/SegmentTypes.h
Calculate distance from QueryPoint to segment (StartPt,EndPt)
static T FastDistanceSquared ( const [TVector2](API\Runtime\Core\Math\TVector2)< T > & StartPt, const [TVector2](API\Runtime\Core\Math\TVector2)< T > & EndPt, const [TVector2](API\Runtime\Core\Math\TVector2)< T > & QueryPt, T Tolerance )